2021443212421 has 2 divisors, whose sum is σ = 2021443212422. Its totient is φ = 2021443212420.

The previous prime is 2021443212409. The next prime is 2021443212461. The reversal of 2021443212421 is 1242123441202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1423342055521 + 598101156900 = 1193039^2 + 773370^2 .

It is a cyclic number.

It is not a de Polignac number, because 2021443212421 - 2¹¹ = 2021443210373 is a prime.

It is a super-2 number, since 2×2021443212421² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2021443212421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2021443212401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010721606210 + 1010721606211.

It is an arithmetic number, because the mean of its divisors is an integer number (1010721606211).

Almost surely, 2^{2021443212421} is an apocalyptic number.

It is an amenable number.

2021443212421 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021443212421 is an equidigital number, since it uses as much as digits as its factorization.

2021443212421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6144, while the sum is 28.

Adding to 2021443212421 its reverse (1242123441202), we get a palindrome (3263566653623).

The spelling of 2021443212421 in words is "two trillion, twenty-one billion, four hundred forty-three million, two hundred twelve thousand, four hundred twenty-one".